Atom, Isotope, Avogadro's #, and molar mass problems
100
anything that occupies space and has mass is
matter
100
How many seconds old is a 5 year old?
1.57 X 10 ^8
100
How many sig figs in 3000.0
5
100
Define the law of conservation of mass
Matter cannot be created or destroyed
100
How many protons, neutrons, and electrons in Gallium?
31 protons, 31 electrons, and 38 neutrons
200
CO2 is an example of what kind of a pure substance?
a compound
200
Convert 100 g/L to lb/ft^3
6.24
200
How many sig figs in 702.670?
6
200
How many moles are in 3.4 X 10^23 molecules of Xenon?
0.56 moles of Xe
200
How many moles in 25 grams of Nitrogen?
1.8 moles of N
300
Which of the following is a homogeneous compound: sweet tea, soil, or salad dressing?
sweet tea
300
Convert 60 degrees Fahrenheit to Kelvin
288.706 K
300
Calculate the following to the correct number of sig figs: (560.7 + 52) / 6.75
90.8
300
Magnesium occurs in nature in three isotopic forms:
relative mass
24Mg (78.70% abundance) 23.985 amu
26Mg (11.17% abundance) 25.983 amu
25Mg (10.13% abundance) 24.986 amu
Calculate the atomic mass of Magnesium from these data
24.31 amu
300
How many grams in 4.500 particles of silver?
8.061 X 10 ^-22 grams of silver
400
Which of the following are examples of a physical change: burning wood, boiling water, rusting of iron, baking a cake or cutting wood?
boiling water and cutting wood
400
The cost of 1.00 Liters of gas is 26.9 cents. How many dollars will 12.0 gallons cost?
12.22 dollars
400
Calculate the following to the correct number of sig figs: (10.0 X 2.3) -7
16
400
Define the Law of definite proportions and provide an example in terms of a PB&J sandwich.
All samples of a given compound, regardless of their source or how they were prepared have the same proportions of their constituent elements.
400
How many protons, neutrons, and electrons in the isotope 204 Ti?
81 protons
81 electrons
123 neutrons
500
Which of the following are examples of chemical properties: odor, color change, density, acidity, or flammability?
color change, acidity, and flammability
500
What is the volume (in in^3) of 100 grams of mercury if the density of mercury is 13.6 g/mL?
7.35 cm^3 and 0.449 in^3
500
Calculate the following to the correct number of sig figs
(17.2 -12) X (0.2300 / 1.1)
1
500
Draw a model of the atom based on nuclear theory and clearly identify the protons, neutrons, and electrons.
500
What is the atomic number, mass number and symbol for the element that has 45 protons and 58 neutrons?